How do you check the size limit of an account?
There's no way of knowing that without knowing what your ISP is and, in some cases, what level account you have. Try Googling the name of your ISP along with
maximum size of email attachments.
For example...
gmail maximum size of email attachments
btinternet maximum size of email attachments
rogers maximum size of email attachments
earthlink maximum size of email attachments
cox maximum size of email attachments
How would I know if it is drm protected?
If you ripped it off a CD, it probably is not "protected" (aka crippled).
But you can always try listening to the file on another computer if you think it's somehow locked itself to your particular computer CD drive.
After ripping the cd and r-clicking on the track I want to send,there is no reference of any kind to attachments in the menu.
Open your email, create a message, and add the file as an attachment.